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Zhu Z.,Jiangsu Provincial Technology Research Center for Water Transport Engineering | Zhou K.,China Shipbuilding NDRI Engineering Co.
Applied Mechanics and Materials | Year: 2012

In order to obtain more accurate results than the traditional method of wave statistics,the third-generation ocean wave model WAVEWATCH III (WW3) is applied to simulate the sea wave field of the Northwest Pacific, driven by the QSCAT/NCEP blended winds. Wave parameters are analyzed by statistical analysis method. The comparison of the significant wave heights between the simulation results and observation data shows that the correlation coefficient is greater than 0.9, indicating that the WW3 model can be applied in wave hindcasting of the Northwest Pacific. Furthermore, a post-processor system integrating data analysis and graphic display is established. A comprehensive evaluation is presented after analyzing the time and spatial distribution of computational wave heights. In conclusion, during the winter there is a big wave area in the Japan Sea. In the East China Sea, there is a period of relatively big wave in summer. Throughout the year, the average wave height is the maximum in the South China Sea. © (2012) Trans Tech Publications, Switzerland.

Dong J.-G.,Tongji University | Dong Z.-Z.,China Shipbuilding NDRI Engineering Co. | Yuan J.-Y.,Tongji University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

A new method-the simplified theoretical method for calculating the settlement of piled box raft foundations for high buildings is proposed. This method is simple and convenient and can be calculated manually. Its calculated parameters are easy to be determined. The calculated value of settlement does not need the empirical coefficient for the depth modification. This method can show the nonlinear relation between the settlement and the load of the buildings. The comparison between the calculated and extrapolated measured values of the final settlement shows that the proposed method is feasible in Shanghai as well as in other cities. It can be supplement as the national standard "Code for design of building foundation" (GB50007-2002) considering the settlement calculation mode in shear stress of pile side.

Fan Y.,Tongji University | Quan Y.,Tongji University | Gu M.,Tongji University | Ni J.,China Shipbuilding NDRI Engineering Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

With a series of wind tunnel tests of rigid models for the single-span gable roof of industrial buildings of different sizes, the mean wind pressure fields under various wind directions and the effects of geometry and exposure on the wind pressure coefficients of the main wind force resistance systems are studied. The test results show that the height-width ratios and wind directions have greater effects on the mean wind pressure coefficients of the main frame beam roof than the aspect ratios and exposures. Moreover, the wind pressure characteristics are found to be significantly different between the main frame beam roofs of the central and the end bays. The suction on the main frame beam roof increases with the height-width ratio. The suction on the central frame beam roof increases with the increase of wind direction angle, and the suction on the end frame beam roof changes significantly with no obvious trend. Since the mean wind pressure is distributed approximately uniformly over the main frame column wall, the wind pressure coefficients can be calculated using the methods in the MBMA2002. Based on the test data, wind pressure coefficients of the main frame beam roof were fitted using the damped least squares techniques.

Jiang J.,China Shipbuilding NDRI Engineering Co. | Gu Q.-Y.,China Shipbuilding NDRI Engineering Co. | Huang M.-S.,Tongji University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The load transfer method is adopted to obtain the simplified nonlinear analysis of settlement of vertically loaded single pile in dock pits after excavation. Considering the overconsolidation effect and nonlinear interaction between piles and soils, the theoretical model agrees with the fact quite well. The governing equation of single pile is solved by the finite difference method. The results of the finite element are compared with the calculated results, which proves the predictive capacity of the proposed method.

Zhou Y.,Tongji University | Yu H.,Tongji University | Qian J.,Tongji University | Hu K.,China Shipbuilding NDRI Engineering Co. | Qu G.,China Shipbuilding NDRI Engineering Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

Innovative types of joints are recently used to connect concrete filled steel tubular laminated (CFTL) columns and reinforced concrete beams. The research on the calculation method of the moment capacity of innovative joints is strongly needed. Considering the axial compression load on the ring beams by the outside concrete, mechanical analysis of the failure isolation body of the ring beam was done using limit equilibrium method. This paper modifies the moment capacity calculation method of joints of ring beams and concrete filled steel tubular columns. The calculation results were about 28% higher than those of static tests, and based on this data the calculation method was further modified. Finally the modified calculation method was verified by experiments and ABAQUS finite element analysis under different axial compression ratios. And the results show that modified method can be used to calculate the moment capacity of joints of ring beams and CFTL laminated columns, and the calculation results are conservative. ©, 2015, Science Press. All right reserved.

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